If a ball travels 75mph on a little league field how fast would it travel on a major league field?

The speed of a ball does not change based on the size of the field; it remains the same regardless of the playing surface. Therefore, if a ball travels at 75 mph on a little league field, it would also travel at 75 mph on a major league field. However, the distance it covers and the perception of speed may differ due to the larger dimensions of the major league field.